7 Speed hyper-glide freewheel from Shimano, ideal replacement for mountain and hybrid bikes. A reliable 7-speed screw-on freewheel. Hyper-glide gear sprockets ensure accurate and smooth shifting every time - up or down the gears. Compact and convenient unit for 7-speed gear systems. Multi-freewheel design means the whole unit is simply screwed onto a compatible hub. Suitable for a wide range of bikes. For use with mountain and hybrid bikes.

The Freewheel MF-TZ21 14-28 Teeth 7 Speed is another outstanding addition to the Shimano family of products. Shimano is the #1 brand in cycling parts, especially shifters, derailleurs, sprockets and brakes.

Shift smoothly across everything from steep, rock-strewn trails to smooth-buffed XC loops with the Shimano XT CS-M8000 Cassette. Whether you're overhauling your trail bike's chewed-up cassette or converting to a 1x11 drivetrain, this 11-speed cassette shaves precious grams while standing up to abuse on the trail with its mixture of lightweight aluminum and robust steel cogs. Rhythm step gear progression ensures precise shifting without annoying ghost shifts on the trail. The wide range of available gears saves your knees from undue stress on lung-busting climbs, available in 11-40T, 11-42T, or 11-46T versions to suit your riding style and local terrain.

Shimano's Ultegra-level cassettes are one of the gems of cycling components. Significantly cheaper than the top-line Dura-Ace offerings, they're also more durable, and only slightly heavier. And, they're heavier in the center of a wheel, where their effect is negligible. Shimano's improved its shifting ramps on this iteration, too, meaning the fabulous shift quality you expect from the Japanese component giant is even better than you remember.

At a time when electronic drivetrains are gaining unstoppable traction, we appreciate that Shimano chose not to neglect its storied pro-level mechanical drivetrain for Di2, making careful, meticulous updates that have resulted in subtle, but significant, improvements to functionality. For those of us who still unabashedly believe in the soul of mechanical shifting, the Dura-Ace RD-R9100 11-Speed Rear Derailleur feeds our love for self-actuated shifting with a more protected position and cleaner mounting interface. When redesigning Dura-Ace, Shimano carried over the modifications to the rear derailleur shaping from Di2 to 9100. That involved altering the low-profile Shadow design slightly to better protect it in the event of a crash. This slimmer, more streamlined shape integrates expertly with the sleek aesthetics of the Dura-Ace 9100 drivetrain as a whole, delivering smoother lines and a less utilitarian appearance. Shimano also worked to improve shifting efficiency on the rear derailleur, constructing the pulley to remain a consistent distance away from the cassette for more dependable shifts. The shorter, effortless shift throws on the levers result in crisp chain jumps up and down the cassette all day long with no sign of getting bogged down. Shimano also looked to its mounta...